"like" ktvu channel 2 news on facebook and you will find a presidential quiz there. >>> ktvu's cara liu talks to the election's chief about a startling statistic. >> reporter: he voted early today because he is leaving the country for 10 months. >> if you care anything about the country, this is the one thing you can do. >> reporter: as it turns out young voters are 4 times more likely to have their ballots thrown out because of a rejected signature. >> it is important. >> reporter: contra costa county elections chief says they noticed a spike in rejected signatures in 2010. >> we ran a study, it wasn't the older population, it was the 20-39-year-old. 50% of signature rejections. >> reporter: your signature is matched against your signature card. >> reporter: how you sign your name on the back of the envelope is key. >> they don't have to match perfectly but we got to be able to say yes, that is the same person. >> reporter: one theory is some may not pay close attention when signing their name. but every vote should matter. >> that could mean an election is lost because of that. and it